Windows 10 1903 build 18362.329 (KB4512941) landed on the production ring as an optional update a short while ago. Some people who installed that optional update are now fighting a problem that makes the machine use abnormally high levels of CPU power. The Windows 10 build was a cumulative update that fixed several issues that Windows 10 users

Source: Hot Hardware – Windows 10 Update 1903 Reportedly Causing High CPU Usage For Some